Initial commit

.gitignore

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+busybox
+linux
+kernel.img
+rootfs.img

Makefile

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+run: kernel.img rootfs.img
+	qemu-system-x86_64 -kernel kernel.img -append "root=/dev/ram rdinit=/sbin/init" -initrd rootfs.img
+
+debug: kernel.img rootfs.img
+	qemu-system-x86_64 -kernel kernel.img -append "root=/dev/ram rdinit=/sbin/init kgdboc=ttyS0,115200 kgdbwait" -initrd rootfs.img -serial tcp::1234,server &
+	gdb linux/vmlinux
+
+install: linux/.config busybox/.config
+	./install
+
+kernel.img: linux/arch/x86/boot/bzImage 
+	make -C linux bzImage -j4
+	cp linux/arch/x86/boot/bzImage kernel.img
+
+rootfs.img: busybox/_install/bin/busybox
+	make -C busybox install -j4
+	./mkrootfs
+
+.PHONY: run debug install

README.md

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+# kernel-dev
+
+Setup the kernel developing environment automatically.
+
+## requirements
+
+ * gdb
+ * gcc
+ * make
+ * QEMU
+
+## install
+
+	make install
+
+## run testing system
+
+	make run
+
+## run debugging system
+
+	make debug
+
+## warning
+
+Before everything, do read and get through each file.

install

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+#!/bin/bash
+
+LINUX=linux
+BUSYBOX=busybox
+
+[ -d $LINUX ] || git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git $LINUX
+
+make -C $LINUX defconfig
+
+${LINUX}/scripts/config --file ${LINUX}/.config --enable CONFIG_EXPERIMENTAL
+${LINUX}/scripts/config --file ${LINUX}/.config --enable CONFIG_DEBUG_INFO
+${LINUX}/scripts/config --file ${LINUX}/.config --enable CONFIG_KGDB
+${LINUX}/scripts/config --file ${LINUX}/.config --enable CONFIG_KGDB_SERIAL_CONSOLE
+${LINUX}/scripts/config --file ${LINUX}/.config --disable CONFIG_DEBUG_RODATA
+
+[ -d $BUSYBOX ] || git://git.busybox.net/busybox $BUSYBOX
+
+make -C $BUSYBOX defconfig
+
+${LINUX}/scripts/config --file ${BUSYBOX}/.config --enable CONFIG_STATIC
+${LINUX}/scripts/config --file ${BUSYBOX}/.config --enable CONFIG_INSTALL_NO_USR

mkrootfs

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+#!/bin/bash
+
+CWD=$(pwd)
+BUSYBOX=busybox
+
+TMPDIR=$(mktemp -d .tmp.XXXXXXXX)
+
+cd $TMPDIR
+
+mkdir -p dev etc/init.d mnt proc root sys tmp
+chmod a+rwxt tmp
+
+cp -rf ${CWD}/${BUSYBOX}/_install/* ./
+
+cat << EOF > etc/profile
+echo
+echo "Let's hack the kernel!"
+echo
+EOF
+
+cat << EOF > etc/fstab
+proc  /proc  proc  defaults  0  0
+sysfs  /sys  sysfs defaults  0  0
+tmpfs  /tmp  tmpfs defaults  0  0
+EOF
+
+cat << EOF > etc/inittab
+::sysinit:/etc/init.d/rcS
+::respawn:-/bin/sh
+tty2::askfirst:-/bin/sh
+::ctrlaltdel:/bin/umount -a -r
+EOF
+
+cat << EOF > etc/init.d/rcS
+#!bin/sh
+/bin/mount -a
+/sbin/mdev -s
+EOF
+
+chmod 755 etc/init.d/rcS
+
+find ./ | cpio -o -H newc | gzip > $CWD/rootfs.img
+
+cd $CWD
+
+rm -rf $TMPDIR
+
+exit 0